赤あか帽ぼう

noun

red cap; red hat

Literal meaning: a cap or hat that is red in color. Can refer to any red headwear, but often associated with the uniform of railway porters.

• 駅えきで赤あか帽ぼうをかぶった人ひとが荷に物もつを運はこんでくれた。

  A person wearing a red cap carried my luggage at the station.

noun

railway porter; redcap

By metonymy, a porter at a railway station who traditionally wears a red cap as part of the uniform. This usage is somewhat dated but still understood.